Synthesis and dehydriding studies of Mg–N–H systems

• Published in: Journal of power sources Vol. 138; no. 1; pp. 309 - 312
• Main Authors: Nakamori, Y., Kitahara, G., Orimo, S.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.11.2004; Elsevier Sequoia
• Subjects: Alternative fuels. Production and utilization; Amide; Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fuel cells; Fuels; Hydrogen; Hydrogen storage; Imide; Lithium; Magnesium; Solid–gas reaction; Imide; Lithium; Amide; Hydrogen storage; Magnesium; Solid–gas reaction; High performance; Hydrogen; Secondary cell; Solid-gas reaction; Fuel cell
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2004.06.026

Light-elemental amides and imides are recently regarded as potential candidates for high-performance hydrogen storage materials. In this studies, the single phases magnesium amide (Mg(NH 2) 2) and magnesium imide (MgNH) were successfully prepared by solid–gas reactions of MgH 2 with ammonia at 613 K and 653 K, respectively. Subsequently, Mg(NH 2) 2 was mixed with different molars of MgH 2 or LiH in order to systematically investigate the dehydriding properties. With increasing temperature, the mixtures of Mg(NH 2) 2 and MgH 2 desorb ammonia at approximately 630 K, similar to the decomposition reaction of Mg(NH 2) 2 alone. On the other hand, the mixture of Mg(NH 2) 2 and 4 M of LiH desorbs only hydrogen during heating because of the “ultra-fast” reaction of LiH with ammonia from Mg(NH 2) 2, unlike MgH 2.